The Best Web Site Ever: FreeRice.com

The stated mission of this web site is simple: Provide English vocabulary to everyone for free, and help end world hunger by providing rice to hungry people for free.

More from the FreeRice.com ‘About’ page:

Whether you are CEO of a large corporation or a street child in a poor country, improving your vocabulary can improve your life. It is a great investment in yourself.

Perhaps even greater is the investment your donated rice makes in hungry human beings, enabling them to function and be productive. Somewhere in the world, a person is eating rice that you helped provide. Thank you.

The site has two addictive qualities: The vocabulary exercise is great fun, and it is nice to see your contribution against hunger grow as you go.